Thanks to the first lady, Will Ferrell is going to stop eating only candy on Sundays and entire honey baked hams.

To celebrate the fourth anniversary of Let’s Move, Michelle Obama’s initiative to end the childhood obesity epidemic, the pair hosted a “focus group” with a bunch of kids, quizzing them about what foods, music and celebrities appeal to them, in a humorous Web video posted to Let’s Move’s YouTube account.

But Ferrell seemed to learn more about his own eating habits than the kids’ diets.

“Diet cola — is that a vegetable?” he asked Obama, who shook her head while the kids laughed at the silly question.